Petrogenesis of the Zhangmatun gabbro in the Ji’nan complex, North China Craton: Implications for skarn-type iron mineralization

The Zhangmatun gabbro is part of the Ji’nan complex in the North China Craton. It is spatially and temporally associated with the Zhangmatun skarn-type high-grade iron deposit. U–Pb dating of zircons from the Zhangmatun gabbro yielded an age of 130.2 ± 1.8 Ma, indicating the emplacement time as Early Cretaceous. The Zhangmatun gabbro displays porphyritic texture with plagioclase and clinopyroxene as the major phenocryst phases, together with...